Internal Server Error with Nginx and uWSGI

Question

I'm trying to host an app using Nginx on Linode.com but I'm stuck early on uWSGI config.

I've used "Getting Started" guide and "WSGI using uWSGI and nginx on Ubuntu 12.04 (Precise Pangolin)" guide and I've succesfully deployed Nginx (got Nginx welcome message in browser).

Although above tutorial is for Ubuntu 12.04 I've used 14.04.

The problem starts when I got to uWSGI configuration and 'Hello World' Python app. Going to location / in browser returns Failed to load resource: the server responded with a status of 500 (Internal Server Error) and nothing gets logged in server error.log. location /static works though and serves files without a hitch.

I've tried many things and looked extensively for fix on Google and Stackoverflow but nothing, and I'm kind of frustrated right now.

Thank you for any help.

Here are my config files (I've hidden my domain and ip):

/etc/hosts

127.0.0.1   localhost
127.0.1.1   ubuntu
XX.XX.XX.XXX mars

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

/etc/nginx/sites-enabled/example.com

server {
    listen      80;
    server_name $hostname;
    access_log  /srv/www/example.com/logs/access.log;
    error_log   /srv/www/example.com/logs/error.log;

    location / {
        #uwsgi_pass 127.0.0.1:9001;
        uwsgi_pass  unix:///run/uwsgi/app/example.com/example.com.socket;
        include     uwsgi_params;
        uwsgi_param UWSGI_SCHEME $scheme;
        uwsgi_param SERVER_SOFTWARE nginx/$nginx_version;
    }

    location /static {
        root        /srv/www/example.com/public_html/;
        index       index.html index.htm;
    }

}

/etc/uwsgi/apps-enabled/example.com.xml

<uwsgi>
    <plugin>python</plugin>
    <socket>/run/uwsgi/app/example.com/example.com.socket</socket>
    <pythonpath>/srv/www/example.com/application/</pythonpath>
    <app mountpoint="/">

        <script>wsgi_configuration_module</script>

    </app>
    <master/>
    <processes>4</processes>
    <harakiri>60</harakiri>
    <reload-mercy>8</reload-mercy>
    <cpu-affinity>1</cpu-affinity>
    <stats>/tmp/stats.socket</stats>
    <max-requests>2000</max-requests>
    <limit-as>512</limit-as>
    <reload-on-as>256</reload-on-as>
    <reload-on-rss>192</reload-on-rss>
    <no-orphans/>
    <vacuum/>
</uwsgi>

/srv/www/example.com/application/wsgi_configuration_module.py

import os
import sys
sys.path.append('/srv/www/example.com/application')
os.environ['PYTHON_EGG_CACHE'] = '/srv/www/example.com/.python-egg'

def application(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/html')])

    return 'Hello world!'

last access log

XX.XX.XX.XXX - - [05/Jul/2015:10:03:37 -0400] "GET / HTTP/1.1" 500 32 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36"
XX.XX.XX.XXX - - [05/Jul/2015:10:03:38 -0400] "GET /favicon.ico HTTP/1.1" 500 32 "http://example.com/" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36"

only error log I've got only one time when trying to fix this

2015/07/05 08:49:06 [crit] 25301#0: *17 connect() to unix:///run/uwsgi/app/example.com/example.com.socket failed (2: No such file or directory) while connecting to upstream, client: XX.XX.XX.XXX, server: mars, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:///run/uwsgi/app/example.com/example.com.socket:", host: "example.com"
2015/07/05 08:49:07 [crit] 25301#0: *17 connect() to unix:///run/uwsgi/app/example.com/example.com.socket failed (2: No such file or directory) while connecting to upstream, client: XX.XX.XX.XXX, server: mars, request: "GET /favicon.ico HTTP/1.1", upstream: "uwsgi://unix:///run/uwsgi/app/example.com/example.com.socket:", host: "example.com", referrer: "http://example.com/"

Answer 1

I do not understand what is it /etc/nginx/sites-enabled/dev.host.in? how to or why *.in? i think u should try it

step 1.

create project.ini file

# django_project.ini file
[uwsgi]

# Django-related settings
# the base directory (full path)
chdir           = /home/username/django_project
# Django's wsgi file
module          = blog.wsgi
# the virtualenv (full path)
home            = /home/username/Env/project
# process-related settings
master          = true
pidfile         = /tmp/proj_uwsgi.pid
# maximum number of worker processes
processes       = 5
# the socket
socket          = :8001
# ... with appropriate permissions - may be needed
# chmod-socket    = 664
# clear environment on exit
vacuum           = true
# background the process
daemonize        = /home/username/django_project/error_uwsgi.log


step 2.

create mysite.conf in nginx, vim /etc/nginx/conf.d/mysite.conf

upstream django {
    #server unix:///home/username/django_project/djproj.sock; # for a file socket
    server 127.0.0.1:8001; # for a web port socket (we'll use this first)
}

# configuration of the server
server {
    # the port your site will be served on
    listen      80;
    # the domain name it will serve for
    server_name localhost mysite.com www.mysite.com; # substitute your machine's IP address or FQDN
    charset     utf-8;

    # max upload size
    client_max_body_size 75M;   # adjust to taste

    # Django media
    location /media  {        alias /home/username/django_project/media;  # your Django project's media files - amend as required
    }

    location /static {        alias /home/username/django_project/static; # your Django project's static files - amend as required
    }

    # Finally, send all non-media requests to the Django server.
    location / {
        uwsgi_pass  127.0.0.1:8001;#project;        
        include     /home/username/django_project/uwsgi_params; # the uwsgi_params file you installed
    }
}



step 3.

ln -s /etc/nginx/uwsgi_params /home/username/django_project/

step 4.

uwsgi --ini django_project.ini

uwsgi --stop /tmp/proj_uwsgi.pid
uwsgi --reload /tmp/proj_uwsgi.pid